SOLUTION: Solve by elimination method 3r-4s=-19 4r+3s=33

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Question 293149: Solve by elimination method
3r-4s=-19
4r+3s=33
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
3r-4s=-19 MULTIPLY BY 3
4r+3s=33 MULTIPLY BY 4 & ADD.
9r-12s=-57
16r+12s=132
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25r=75
r=75/25
r=3 ans.
3*3-4r=-19
9-4s-19
-4s-19-9
-4s-28
s-28/-4
s=7 ans.
Proof:
4*3+3*7=33
12+21=33
33=33